论文标题
具有中等规模的轴轴模型费米子暗物质
Axion Model with Intermediate Scale Fermionic Dark Matter
论文作者
论文摘要
我们研究了一个非苏匹马对称$ SO（10）\ times U（1）_ {\ rm pq} $轴轴模型，其中自发断裂在通货膨胀后发生$ u（1）_ {\ rm pq} $，在通货膨胀后发生，轴支域壁问题通过使用lazarides-shafi-shafi-shafi-shafi-shafi-shafi hectimist。这需要引入两个费米亚10件，以便从显式$ u（1）_ {\ rm pq} $ breaking从$ z_ {12} $中缩小到$ z_4 $，其中$ z_4 $与$ z_4 $相关的中心（更多（10）$（10）$（10）$（10）$（10） $ Z_4 $的不间断的$ Z_2 $子组产生拓扑稳定的中等规模，以及一个稳定的Electroweak Doublet Doublet Doublet Doublet Doublet Dublet Dumberal Dark Matter候选，来自Fermion 10-peters，其质量可比或比轴衰变常数$ f _ {\ rm A} $相当或稍小。我们提出了一种明确的实现，并考虑了通货膨胀，并且还结合了非热静脉生成。 fermion暗物质质量位于$ 3 \ times 10^{8} -10^{10}〜{\ rm gev} $ range及其对遗物暗物质丰度的贡献可以与轴心相媲美。
We investigate a non-supersymmetric $SO(10)\times U(1)_{\rm PQ}$ axion model in which the spontaneous breaking of $U(1)_{\rm PQ}$ occurs after inflation, and the axion domain wall problem is resolved by employing the Lazarides-Shafi mechanism. This requires the introduction of two fermion 10-plets, such that the surviving discrete symmetry from the explicit $U(1)_{\rm PQ}$ breaking by QCD instantons is reduced from $Z_{12}$ to $Z_4$, where $Z_4$ coincides with the center of $SO(10)$ (more precisely $Spin(10)$). An unbroken $Z_2$ subgroup of $Z_4$ yields intermediate scale topologically stable strings, as well as a stable electroweak doublet non-thermal dark matter candidate from the fermion 10-plets with mass comparable to or somewhat smaller than the axion decay constant $f_{\rm a}$. We present an explicit realization with inflation taken into account and which also incorporates non-thermal leptogenesis. The fermion dark matter mass lies in the $3\times 10^{8}-10^{10}~{\rm GeV}$ range and its contribution to the relic dark matter abundance can be comparable to that from the axion.
